Victor,
You should be just fine with regular Cheddite 209 primers. They will ignite without any problems and when you go to magnum primers you are raising the pressure which I am assuming is what you are trying to avoid with using bp loads. 16 gauge cards and wads are what you want in a 16 plastic hull. If you were using brass hulls then you would probably go up to 17. I generally use FFg in 12 and 16. FFFg may raise the pressure some. I just use an old bp/shot dipper for measuring. If you want to get more precise than that weight it out on a scale, but the dipper is close enough for me.
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